Shell 打印指定行或模式之间的文本

$ awk 'NR==M, NR==N' filename

$ cat filename | awk 'NR==M, NR==N'

$ seq 100 | awk 'NR==4,NR==6'
4
5
6

$ awk '/start_pattern/, /end_pattern/' filename

$ cat section.txt
line with pattern1
line with pattern2
line with pattern3
line end with pattern4
line with pattern5

$ awk '/pa.*3/, /end/' section.txt
line with pattern3
line end with pattern4